[PATCH] gigaset: gigaset_isowbuf_getbytes() may return signed unnoticed

[Roel Kluin]

ifd->offset is unsigned. gigaset_isowbuf_getbytes() may return signed unnoticed

Signed-off-by: Roel Kluin <12o3l@xxxxxxxxxx>
---
diff --git a/drivers/isdn/gigaset/bas-gigaset.c b/drivers/isdn/gigaset/bas-gigaset.c
index 5255b5e..c97479b 100644
--- a/drivers/isdn/gigaset/bas-gigaset.c
+++ b/drivers/isdn/gigaset/bas-gigaset.c
@@ -1050,9 +1050,9 @@ static int submit_iso_write_urb(struct isow_urbctx_t *ucx)
 		}
 
 		/* retrieve block of data to send */
-		ifd->offset = gigaset_isowbuf_getbytes(ubc->isooutbuf,
-						       ifd->length);
-		if (ifd->offset < 0) {
+		rc = gigaset_isowbuf_getbytes(ubc->isooutbuf, ifd->length);
+		ifd->offset = rc;
+		if (rc < 0) {
 			if (ifd->offset == -EBUSY) {
 				gig_dbg(DEBUG_ISO,
 					"%s: buffer busy at frame %d",
--
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